Which of the following describes when both eyes rotate about the y axis and the upper portion of their eyes rotate to the right during versions?

• A. Levoversion
• B. Dextrocycloversion
• C. Dextroversion
• D. Levocycloversion

Answer: (B)

This item tests cycloversion, the combination of a conjugate gaze with a torsional rotation of the eyes. When both eyes move to the right together (versions) and there is a torsional rotation so that the upper portions rotate toward the right, that’s called dextrocycloversion. The “dextro” indicates the direction of the torsion with the gaze (to the right), while “cycloversion” denotes the torsional (cyclo) component accompanying the version.

If there were no torsion, it would be a plain dextroversion (gaze to the right without rotation of the top and bottom portions). If the torsion were to the left with leftward gaze, it would be levocycloversion; if the torsion were to the left with leftward gaze but no torsion, it would be levoversion.